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  1. #1
    crowie's Avatar
    crowie is online now Life's Good, Enjoy each new day & try to encourage
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    Default Advice & Assistance for making a Dust Collector Unit

    G'Day All,
    I'm after some advice & assistance for making a Dust Collector Unit.
    My neighbour has offered me Blower Unit from a printing machine which used to take paper dust out of the machine.
    The motor is 0.55kw 415v on a plug & lead; my cousin will do the 3phase 10amp outlet from the box to the workshop.
    The blower has a 100mm inlet & outlets and there is quite a bit of metal ducting pipe work, so I have the basics.
    I need some direction on firstly running the piping/ducting to the machinery??
    I was thinking of just using it like a big vacuum cleaner having a length of flexible hose to connect to which ever machine I am using.
    But then the big issue is, how to collect the dust & exhaust the blower air??
    Thank you in advanced for whatever direction and suggestions that are offered; drawings & photos would be greatly appreciated.
    Cheers, crowie

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  3. #2
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    Recommended motor sizes for dust extraction are 3hp upward. Duct size recommendations, and therefore blower unit inlet and outlet sizes, are 150mm (6inch). 100mm dust ports are the common size on most woodwork machinery so alteration to 150mm to accommodate the ducting is recommended.

    Generally the shorter the ducting from the blower to the machine the better. The straighter the better and the smoother the better. So try to avoid any bends, especially tight ones and use smooth bore ducting where possible. Keep the flexible lengths as short and minimal as possible.

    When collecting the dust you may want to include a cyclone or separator between the blower and the machine. This will separate the fines and courser particles. Venting of the fine material would ideally be external to the shed, i.e to the outside. This can be achieved by either having the unit sitting inside the shed with the outlet pushed outside, or by placing as much of the dust extraction setup as possible outside and running the ducting through the wall. The latter will help limit the affects of any dust leakage from the setup into the workspace.
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  4. #3
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    0.55kW is about 3/4 HP which will move very little air - especially under pressure.

    Can you take a photo of the inside of the impeller.
    Chances are that it is a squirrel cage fan which generates very little pressure anyway.

    If you are starting from scratch, 100 mm outlets and ducting are something I would be avoiding - they cannot carry enough air - 6" is a minimum that should be used but even a 1HP motor cannot move enough air to keep sawdust suspended in a 6" duct..

    You need at least 2HP to carry enough air in a 6" duct but 3 or more HP is better

    Id suggest not bothering with it for dust extraction but it might make a zero resistance extractor fan for a spray paint or welding booth.

  5. #4
    crowie's Avatar
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    Thanks gents,
    I appreciate the information thus far but if I can't do it with what's on offer I'll put up with my homemade mini cyclone & 2000w vacuum cleaner.
    Here are some photos of the blower unit on offer.....it was used to draw paper away from a printing machine....
    A couple of photos of the motor identification plate....
    The blower fan looks like a large pump impeller....
    There's a photo of some of the ducting available....
    I don't really have the room for this unit but am thinking about locating it outside the garage/shed/workshop....
    I only have 5'11" head height for the most and the work area is about 2.4 to 3mtrs in a rough rectangle...
    [theses a bench, a table saw, drill press, disc sander, bobbin sander, SCMS on the bench, a bandsaw plus tools.]
    How to collect the dust will be an issue PLUS how to exhaust the air???
    Cheers, crowie
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  6. #5
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    The impeller and unit looks like blowers similar to those used for fume hoods in laboratories. While better in terms of pressure than a squirrel cages, the straight bladed impeller will not be as efficient as the curved impeller blades used on most DCs and will still not generate sufficient pressure to overcome the resistances commonly found in woodworking machines and filtration systems

    Apart from what I said in my previous post about the only other thing it would be useful for is as a unit to vent the shed of fine dust.

  7. #6
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    As has been said... it's a nice little unit but just too small for any real dust collection, best use is ventilation of the shed, my DC has a 3kw (4 hp) motor.



    Pete

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